Terminal for electric-lamp glowers.



"No. 684,092. Patented Oct. :3, 1901.

v H. N. POTTER.

TERMINAL FOB ELEQTRI O LAMP GLOWEBS.

(Application flId Aug. 9, 1899.)

(No Model.)

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UNITED STATES PATENT OFFICE.

HENRY NOEL POTTER, OF GOTTINGEN, GERMANY, ASSIGNOR T O GEORGE WVESTINGHOUSE, OF PITTSBURG, PENNSYLVANIA.

TERMINAL FOR ELECTRIC-LAMP GLOWERS.

SPECIFICATION formingpart of Letters Patent N 0. 684,092, dated, October 8, 1901.

Application filed August 9, 1899. Serial No. 726,623- (No specimens.)

To all whom it may concern..-

Be it known that I, HENRY NOEL POTTER, a citizen of the United States of America, residing in Gottingen, Germany, have invented certain new and useful Improvements in Terminals for Electric-Lamp Glowers, of which the following is a specification.

As a means for securing an intimate connection between the ends of glowers of the type described and the lead-wires of the lighting-circuit I have devised atreatment which accomplishes the desired result by first securing to the said glower ends a closely-adhering film of platinum. A glower having its ends thuscovered with a platinum film can then be connected with the lead-wires by any preferred method or means.

The particular object of my present invention is the preparation of a glower with such a closely-adherent film of platinum. I show and describe such a glower in combination with one or more wires wound about each end and secured in place by a paste of substantially the same material as the glower.

I have illustrated my invention in the accompanying drawings, in which- Figure 1 is an elevation of a glower for electric lamps. Fig. 2 shows an elevation of the same glower after my treatment has been applied thereto, and Fig. 3 illustrates one of my glowers with a terminal wire attached thereto.

In the drawings, A is a glower formed from a rare earth or a mixture of rare earths. In providing such a glower with a film of platinum at each end I employ the following process:

I first mix a paste of platinum arsenite (PtAs and mold or paint a thin coating thereof on each end of the glower A. Having secured a thin layer of the paste on each end' of the glower, I heat the glower to a temperature sufficient to drive off the arsenic and leave a thin film a of platinum on each end of the glower, as illustrated in Fig. 2. that the connection between the platinum thus left upon the glower ends and the material of the glower is very close and intimate, so that the most perfect electrical connection possible exists between the film and the glower. I may now take the glower with the platinum thereon and apply the lead-wires to the glower ends by any suitable process. At the right of Fig. 2 I show a loopb of fine wire ready to he slipped over the platinum at one end of the glower A, and in Fig. 3 I illustrate the glower as it appears after this loop has been passed over the end and covered with a body a of pasty material similar in composi tion to the glower itself.

I claim as my invention 1. The hereinbefore-described method of coating the end of a glower of the type described with platinum,which consists in molding or painting on the said end a thin coating of platinum arsenide and subsequently driving off the arsenic by heat.

2. The improvement in the art of making glowers for electric lamps which consists in applying to the glower ends thin coatings of a platinum compound, changing said coatings to metallic platinum by subjecting them to heat, fastening terminal wires to the coated ends and then applying a coating of like or similar material to that of the body of the glower.

Signed by me at Hanover, Germany, this lath day of July, 1899.

HENRY NOEL POTTER.

Witnesses:

KIRKE LATHROP, W. K. ANDERSON. 

